linux-kernel - Re: [PATCH 3/3] lib/find_bit.c: uninline helper _find_next

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Message-ID: <20200104000843.GA23653@yury-thinkpad>
Date:   Fri, 3 Jan 2020 16:11:13 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Allison Randal <allison@...utok.net>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] lib/find_bit.c: uninline helper _find_next_bit()

On Fri, Jan 03, 2020 at 01:46:07PM -0800, Joe Perches wrote:
> On Fri, 2020-01-03 at 12:28 -0800, Yury Norov wrote:
> > It saves 25% of .text for arm64, and more for BE architectures.
> 
> This seems a rather misleading code size reduction description.
> 
> Please detail the specific code sizes using "size lib/find_bit.o"
> before and after this change.

Before:
$ size lib/find_bit.o
   text    data     bss     dec     hex filename
   1012      56       0    1068     42c lib/find_bit.o

After:
$ size lib/find_bit.o
   text    data     bss     dec     hex filename
    776      56       0     832     340 lib/find_bit.o

> Also, _find_next_bit is used 3 times, perhaps any code size
> increase is appropriate given likely reduced run time.

Second patch of the series switches find_next_zero_bit_le()
and find_next_bit_le() to _find_next_bit(), so totally 5.
 
Yury